BackendAuth_AuditDeny.json

{
  "properties": {
    "displayName": "API Management calls to API backends should be authenticated",
    "policyType": "BuiltIn",
    "mode": "All",
    "description": "Calls from API Management to backends should use some form of authentication, whether via certificates or credentials. Does not apply to Service Fabric backends.",
    "metadata": {
      "version": "1.0.1",
      "category": "API Management"
    },
    "version": "1.0.1",
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.ApiManagement/service/backends"
          },
          {
            "field": "Microsoft.ApiManagement/service/backends/url",
            "exists": "true"
          },
          {
            "field": "Microsoft.ApiManagement/service/backends/protocol",
            "equals": "http"
          },
          {
            "allOf": [
              {
                "anyOf": [
                  {
                    "field": "Microsoft.ApiManagement/service/backends/credentials.certificate",
                    "exists": "false"
                  },
                  {
                    "value": "[length(field('Microsoft.ApiManagement/service/backends/credentials.certificate[*]'))]",
                    "equals": 0
                  }
                ]
              },
              {
                "anyOf": [
                  {
                    "field": "Microsoft.ApiManagement/service/backends/credentials.authorization.scheme",
                    "exists": "false"
                  },
                  {
                    "field": "Microsoft.ApiManagement/service/backends/credentials.authorization.parameter",
                    "exists": "false"
                  }
                ]
              }
            ]
          }
        ]
      },
      "then": {
        "effect": "[parameters('effect')]"
      }
    },
    "parameters": {
      "effect": {
        "type": "string",
        "metadata": {
          "displayName": "Effect",
          "description": "Enable or disable the execution of the policy"
        },
        "allowedValues": [
          "Audit",
          "Disabled",
          "Deny"
        ],
        "defaultValue": "Audit"
      }
    },
    "versions": [
      "1.0.1"
    ]
  },
  "id": "/providers/Microsoft.Authorization/policyDefinitions/c15dcc82-b93c-4dcb-9332-fbf121685b54",
  "name": "c15dcc82-b93c-4dcb-9332-fbf121685b54"
}